Luciana ganhou R$ 260,00 de sua tia. Ela foi ao shopping fazer compras. Gastou R$ 45,00 comprando um par de sapatos. Também comprou um celular que custou o dobro do valor dos sapatos mais R$ 50,00, e uma blusa que custou a metade do preço do celular. Com quanto Luciana ficou?

4400

step-by-step explanation:

hello from mrbilldoesmath!

answer:

x - 3

discussion:

x^2 - 9 = (x-3) (x+3)   so

(x^2-9)/ (x + 3) = x-3

you,

mrb

not only in mathematics, scientific proof also are required in the other field of science. also maths proofs are of particular structure, containing steps and logics. so proving is like doing science, it is science. that's why it is important to prove. 

an inaccurate proof leads to errors, or stating results that are not accurate.  which wil mess the probelm up you dont want this

step-by-step explanation: